Python dependency: Update flask-socketio requirement from ==5.5.* to ==5.6.* in /web/regression

[dependabot]

Updates the requirements on flask-socketio to permit the latest version.

Release notes

Sourced from flask-socketio's releases.

Release 5.6.0

See CHANGES.md for release notes.

Changelog

Sourced from flask-socketio's changelog.

Flask-SocketIO change log

Release 5.6.0 - 2025-12-25

• Use Flask test client's own environ dict if it is available #2142 (commit)
• Add Python 3.13, 3.14 and pypy-3.11 to CI builds, drop 3.8 and 3.9 (commit)
• Documentation: Added an example using the init_app() method #2110 (commit)

Release 5.5.1 - 2025-01-06

• Updated version of python-socketio dependency #2128 (commit) (thanks Okke Harsta!)

Release 5.5.0 - 2024-12-18

• Add a reason argument to the disconnect handler (commit)
• Upgrade the code to more recent Python versions ([commit #1](miguelgrinberg/Flask-SocketIO@6a6734f) [commit #2](miguelgrinberg/Flask-SocketIO@c3667e8))
• Remove misleading warning about use of gevent-websocket in the documentation #2122 (commit)
• fix typo in deployment documentation #2119 (commit) (thanks Maximilien Tirard!)

Release 5.4.1 - 2024-10-01

• Removed a debugging statement (commit)

Release 5.4.0 - 2024-09-30

• Support catch-all events with socketio.on('*') #2095 (commit)

Release 5.3.7 - 2024-09-02

• Prevent crash when client sends empty event (commit)
• Handle events with catch-all namespace #2061 (commit)
• Add unit test for background tasks (commit)
• Drop Python 3.7, add Python 3.12, upgrade to pypy 3.10 (commit)

Release 5.3.6 - 2023-09-05

• Fixes in the test client to support recent changes in Socket.IO dependencies #2006 (commit)

Release 5.3.5 - 2023-07-26

• Prevent allow_unsafe_werkzeug option from being passed to web servers #2001 (commit)

Release 5.3.4 - 2023-05-03

• Fixed cookie handling in Test Client for Flask >= 2.3 #1982 (commit)
• Correctly handle ConnectionRefusedError in connect handler #1959 (commit)
• More secure nginx configuration examples #1966 (commit) (thanks Lorenzo Leonardini!)

Release 5.3.3 - 2023-03-17

... (truncated)

Commits

• e24a2f8 Release 5.6.0
• ccb9a75 Use Flask test client's own environ dict if available (Fixes #2142)
• e05f135 linter fixes #nolog
• 1ad7940 Add Python 3.13, 3.14 and pypy-3.11, drop 3.8 and 3.9
• 78dda9b Added an example using the init_app() method (Fixes #2110)
• 932b9ab Version 5.5.2.dev0
• 3dbc92f Release 5.5.1
• c77c2e8 Updated version of python-socketio dependency (#2128)
• b48f278 revert to default funding file #nolog
• 19ad306 Bump jinja2 from 3.1.3 to 3.1.5 in /example (#2125) #nolog
• Additional commits viewable in compare view

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